Sunday, 27 March 2011

FIFO and LIFO

PRINTER
FIFO - first in first out
Queues have to pointer's. A HP(head pointer) and a TP(tail pointer)
The document that is at the TP is the one that is about to be sent to the printer, as a document is taken from the TP it allows another document to be placed in the print queue, naturally in the HP.

STACK
LIFO - last in first out
Stacks have one pointer, it increments downwards and upwards as new documents/info is processed or added in.
A stack is used to record the returned addresses when a procedure is called.

Thursday, 10 March 2011

RSS

RSS (most commonly expanded as "Really Simple Syndication") is a family of web feed formats used to publish frequently updated works—such as blog entries, news headlines, audio, and video—in a standardized format.

MICROBLOGGING

Microblogging is a broadcast medium in the form of blogging. A microblog differs from a traditional blog in that its content is typically smaller in both actual and aggregate file size. Microblogs "allow users to exchange small elements of content such as short sentences, individual images, or video links".

BLOG

This is a blog

WIKI

A wiki (WIK-ee) is a website that allows the creation and editing of any number of interlinked web pages via a web browser. Examples include community websites, corporate intranets, knowledge management systems, and note services.

Tuesday, 8 March 2011

Representation of different Data types

integer - 32bit
boolean - 1bit
date/time - Integer/Decimal
currency - Decimal (limited)
character - 16bit

Parity Check

The ASCII system is a 7 bit system, because the 8th bit is a parity check.
ASCII - American Standard Code for Information Interchange
7 bits = 128 characters. 

Extended ASCII & Unicode
8 bits = 256 characters UTF-8 UTF-16

Monday, 7 March 2011

Hydrology and Fluvial Geomorphology

Hydrology and Fluvial Geomorphology is the study of the processes of the DRAINAGE BASIN and the processes of the RIVER CHANNEL.

The HYDROLOGICAL CYCLE consists of: -Precipitation
                                                                      -Evaporation
                                                                      -Condensation
 These processes will always occur no matter what else happens(as long as there is solar flux)